7.30. Subtract Layer Mask from Selection

The Subtract from Selection command converts
the layer mask of the active layer into a selection, which is subtracted
from the selection that is already active in the image. White areas of
the layer mask are selected, black areas are not selected, and gray
areas are converted into feathered selections. The layer mask itself is
not modified by this command.

7.30.1. Activating the Command

You can access this command from the image menubar through
Layer → Mask → Subtract from Selection,

7.30.2. Illustration of Subtract Layer Mask from Selection

Figura 16.98. Illustration of Subtract Layer Mask from Selection

On the left, the original image with a selection. In the middle,
the Layers Dialog with a layer mask created with the
“Layer's alpha channel” option. On the right, the
result after applying “Mask to Selection”: the
selection of the non-transparent pixels of the active layer
is subtracted from the initial selection.